"Microsoft's search engine, Bing, was used in 10.7 percent of U.S. online searches in August, according to a new report by research firm Nielsen. That placed it third in the rankings behind Yahoo with 16 percent and Google with 64.6 percent. Microsoft’s month-over-month gain of 22.1 percent in market share suggests that the search engine may have legs even after Microsoft’s supporting ad campaign, estimated at costing between $80 million to $100 million, runs its course."